I have ridden both and the 07 CBR is a better bike. The R6 is nice and the 08 might be the shit but the 07 CBR is going to be hard to beat. I do agree that the R6 looks much better but I but for performance first.
I've ridden both and I now own an '07 R6 for my track bike.
For what it's worth, they say it's the most technologically advanced production bike ever built. Drive by wire throttle control, slipper clutch (which I don't think the CBR has) and a sick rpm range. Plus, the '07 R6 is really designed to be a track bike anyway.